undefined property flag_user (or node, or entity)

getting all sorts of errors spitting back with message subscribe, notably (aside from sample views not showing the subscriptions!):

when viewing a node that allows for subscribing by email or by just node change (both flags enabled, only one is visible for the 'not by email' method)
i see:
Notice: Undefined property: flag_node::$content_type in message_subscribe_email_flag_access() (line 13 of ...sites/all/modules/message_subscribe/message_subscribe_email/message_subscribe_email.module).

for a term/taxonomy page, ditto (can only see flag for the 'not by email' method, then i get:
Notice: Undefined property: flag_entity::$content_type in message_subscribe_email_flag_access() (line 13 of ...sites/all/modules/message_subscribe/message_subscribe_email/message_subscribe_email.module).

ditto for user (again the 'not by email' flag presents itself
Notice: Undefined property: flag_user::$content_type in message_subscribe_email_flag_access() (line 13 of sites/all/modules/message_subscribe/message_subscribe_email/message_subscribe_email.module).

i'm confused, going to dig back through the assorted documentation (which doesn't cover the implementation in the examples in detail, so may just have to scratch all of these flags and start over)....settings seem fine